CN102205305A - Surface processing method for aluminum alloy section before painting - Google Patents
Surface processing method for aluminum alloy section before painting Download PDFInfo
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- CN102205305A CN102205305A CN2011101500398A CN201110150039A CN102205305A CN 102205305 A CN102205305 A CN 102205305A CN 2011101500398 A CN2011101500398 A CN 2011101500398A CN 201110150039 A CN201110150039 A CN 201110150039A CN 102205305 A CN102205305 A CN 102205305A
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- aluminum alloy
- alloy section
- aluminium alloy
- alloy extrusions
- surface processing
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Abstract
The invention belongs to the technical field of surface processing of an aluminum alloy section and particularly relates to the removing of an inorganic protection film on the surface of the aluminum alloy section. A surface processing method for the aluminum alloy section before painting comprises the following steps: 1) performing alkali degreasing on the aluminum alloy section which is subjected to the triclene vapor degreasing and is formed by a metal plate; 2) performing triacid acid cleaning on the aluminum alloy section; and 3) performing heat-treatment quenching, surface treatment and paining on the aluminum alloy section. By using the method, after being quenched, the aluminum alloy section has a normal oxidation tint on the surface. After being sequentially anodized, a film layer has uniform, smooth, compact and continuous appearance. The bonding force between the paint and the basal body is excellent.
Description
Technical field
The invention belongs to the aluminium alloy section surface processing technology field, particularly relate to removal the aluminium alloy section surface inorganic protective film.
Background technology
Aluminium alloy extrusions is a kind of important raw and processed materials of aircraft such as aircraft, and section bar occupies critical role in aerospace industry.Aircraft lightweight process has been accelerated in the whole world in recent years, thereby has promoted aluminium alloy extrusions to use more widely.Aluminium alloy extrusions shared proportion on present generation aircraft is quite big, its quality is directly connected to the assembly precision and the service life of aircraft, becoming the key problem in technology that influences aircraft development and guarantee aeroplane performance, also is one of principal element that influences aircraft manufacturing cycle, costs and benefits.Fuselage weight accounts for 35% of complete machine weight, so the aircraft lightweight at first is the fuselage lightweight, under the prerequisite that does not change aircraft safety, adopts aluminium alloy extrusions can alleviate fuselage weight significantly.Aluminium alloy extrusions density is low, is easy to recycle, and adopts the space frame airframe structure can satisfy the security requirement of impact resistance, thereby promote aluminium alloy extrusions to use more widely.
---panel beating moulding---heat treatment is surface treatment one by one---japanning that the flow process of general aluminum alloy part japanning processing comprises the trichloroethylene steam oil removing.The raw material of aluminum alloy that has special inorganic rush-resisting material for some surface, add as stated above and man-hour occurred aluminium alloy extrusions quenching rear surface melanism, this handles for follow-up chromic acid anodizing and brings certain difficulty, because the atrament on surface does not come out in the chromic acid anodizing pre-treatment, the oxide-film that forms when causing chromic acid anodizing is inhomogeneous, the adhesion of follow-up lacquer and matrix is bad, causes the follow-up depainting phenomenon that occurs of this airplane parts.
Summary of the invention
The objective of the invention is: melanism appears in the section bar surface, aluminium alloy quenching back that the objective of the invention is to avoid the surface to have inorganic protective film.
Technical scheme of the present invention is: the aluminium alloy extrusions that has some inorganic protective film for the surface; such inorganic protective film does not come out with organic solvent; have only the method for the chemical reaction that passes through just can remove, can well get rid of this transparent protective film by three pickling in the actual production.Concrete way is the following surface treatment method of employing before aluminium alloy extrusions quenches:
A kind of aluminium alloy extrusions japanning front surface processing method, this method may further comprise the steps:
The first step is carried out the alkali oil removing to the aluminium alloy extrusions after trichloroethylene steam oil removing and the panel beating moulding;
In second step, aluminium alloy extrusions is carried out three pickling;
In the 3rd step, aluminium alloy extrusions is heat-treated quenching, surface treatment and japanning.
Advantage of the present invention is:
After adopting the present invention, be normal oxidation tint through quenching back aluminium alloy section surface, and the outward appearance of rete is relatively more even, level and smooth, fine and close, continuous after follow-up anodization, the adhesion of lacquer and matrix is also very good.
The specific embodiment
The specific embodiment among the present invention is as follows:
The first step is carried out the alkali oil removing to the aluminium alloy extrusions after trichloroethylene steam oil removing and the panel beating moulding, and the alkali lye prescription is:
Operating condition: 55 ℃～65 ℃ of temperature
Time 3min～5min
In addition, the manner of formulation of № 631 surfactants is: every premium on currency contains
F68 60g
90F 30g
L61 10g
Electrochemical deoiling clean back moisture film 30s do not break for oil removing qualified, otherwise oil removing again.Should carry out the deionization washing after the alkali oil removing, the washing time is greater than 2min, till the wash clean.
Second step, aluminium alloy extrusions is carried out three pickling, the acid solution prescription is:
0.020 millimeter/face of hydrofluoric acid (40%) corrosion rate/hour～0.025 millimeter/face/hour
Time: 1min～3min
Temperature: room temperature
In addition, the hydrofluoric acid that adds 0.03% volume will increase the about 0.0025 millimeter/face of corrosion rate/hour.Answer the deionization washing after three pickling, the washing time is greater than 2min, till the wash clean.
In the 3rd step, aluminium alloy extrusions is heat-treated quenching, surface treatment and japanning.Transparent protective film carries out Quenching Treatment after removing again, can effectively prevent melanism, and quenching technical is salt bath heat treatment, and the salt-mixture that adopts following composition (percentage by weight) is as the poor heat medium of salt made from earth containing a comparatively high percentage of sodium chloride.
Sodium nitrate (NaNO3) 65%-35%;
Potassium nitrate (KNO3) 35%-65%.
Heat-treatment quenching time: 35min, temperature: 493 ℃.
Through after the above technological process, melanism does not appear in aluminium alloy section surface, and the surface is normal color.Again it is carried out surface treatment and japanning.
One embodiment of the present of invention are as follows:
To at present as can be known certain type aluminium alloy extrusions material surface of the Korea S of import at one deck inorganic protective film that dispatched from the factory back section bar surface coverage; this layer material is transparent; with organic solvent is indelible; only before quenching, increase alkali oil removing+three pickling two procedures for fear of the unique method that melanism after the aluminium alloy section surface quenching, occurs; this layer inorganic protective film of piece surface got rid of before quenching process; just being unlikely in salt bath inorganic protective film has taken place rotten in hot conditions; the atrament that generates does not come out with pickling at all; so, only before quenching, just this layer inorganic protective layer removed for fear of melanism occurring.Will promote the course of industrialization of this material to have improved product quality to the research of aluminium alloy extrusions material surface diaphragm, help the prolongation in service life of this material, it is had great application prospect.
Claims (1)
1. aluminium alloy extrusions japanning front surface processing method is characterized in that this method may further comprise the steps:
The first step is carried out the alkali oil removing to the aluminium alloy extrusions after trichloroethylene steam oil removing and the panel beating moulding;
In second step, aluminium alloy extrusions is carried out three pickling;
In the 3rd step, aluminium alloy extrusions is heat-treated quenching, surface treatment and japanning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101500398A CN102205305A (en) | 2011-06-03 | 2011-06-03 | Surface processing method for aluminum alloy section before painting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101500398A CN102205305A (en) | 2011-06-03 | 2011-06-03 | Surface processing method for aluminum alloy section before painting |
Publications (1)
| Publication Number | Publication Date |
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| CN102205305A true CN102205305A (en) | 2011-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101500398A Pending CN102205305A (en) | 2011-06-03 | 2011-06-03 | Surface processing method for aluminum alloy section before painting |
Country Status (1)
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| CN (1) | CN102205305A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106298069A (en) * | 2016-08-29 | 2017-01-04 | 安徽电气集团股份有限公司 | Steel core heat-resisting aluminium alloy twisted wire |
| CN106493217A (en) * | 2015-09-08 | 2017-03-15 | 哈尔滨飞机工业集团有限责任公司 | A kind of manufacturing process of extending of Aluminum Alloy Tube support |
Citations (5)
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| CN101130186A (en) * | 2006-08-25 | 2008-02-27 | 佛山市顺德区汉达精密电子科技有限公司 | Method for spray coating finishing paint on magnesium alloy surface |
| US20100025257A1 (en) * | 2008-07-30 | 2010-02-04 | Shenzhen Futaihong Precision Industry Co., Ltd. | Method for surface treating metal substrate |
| CN101696500A (en) * | 2009-10-26 | 2010-04-21 | 宁波耐特镁业科技发展有限公司 | Method for anticorrosion treatment on surface of magnesium alloy material |
| CN101709459A (en) * | 2009-11-06 | 2010-05-19 | 海洋王照明科技股份有限公司 | Surface treatment method of aluminum alloy and treatment liquid |
| CN101831661A (en) * | 2010-04-01 | 2010-09-15 | 中国科学院宁波材料技术与工程研究所 | Zinc alloy acid-washing solution and zinc alloy acid-washing treating process |
-
2011
- 2011-06-03 CN CN2011101500398A patent/CN102205305A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130186A (en) * | 2006-08-25 | 2008-02-27 | 佛山市顺德区汉达精密电子科技有限公司 | Method for spray coating finishing paint on magnesium alloy surface |
| US20100025257A1 (en) * | 2008-07-30 | 2010-02-04 | Shenzhen Futaihong Precision Industry Co., Ltd. | Method for surface treating metal substrate |
| CN101696500A (en) * | 2009-10-26 | 2010-04-21 | 宁波耐特镁业科技发展有限公司 | Method for anticorrosion treatment on surface of magnesium alloy material |
| CN101709459A (en) * | 2009-11-06 | 2010-05-19 | 海洋王照明科技股份有限公司 | Surface treatment method of aluminum alloy and treatment liquid |
| CN101831661A (en) * | 2010-04-01 | 2010-09-15 | 中国科学院宁波材料技术与工程研究所 | Zinc alloy acid-washing solution and zinc alloy acid-washing treating process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493217A (en) * | 2015-09-08 | 2017-03-15 | 哈尔滨飞机工业集团有限责任公司 | A kind of manufacturing process of extending of Aluminum Alloy Tube support |
| CN106298069A (en) * | 2016-08-29 | 2017-01-04 | 安徽电气集团股份有限公司 | Steel core heat-resisting aluminium alloy twisted wire |
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Application publication date: 20111005 |